Theorem mulcomi 7958

Description: Commutative law for multiplication. (Contributed by NM, 23-Nov-1994.)

Hypotheses

Ref	Expression
axi.1	|- A e. CC
axi.2	|- B e. CC

Assertion

Ref	Expression
mulcomi	|- ( A x. B ) = ( B x. A )

Proof of Theorem mulcomi

Step	Hyp	Ref	Expression
1		axi.1	. 2 |- A e. CC
2		axi.2	. 2 |- B e. CC
3		mulcom 7935	. 2 |- ( ( A e. CC /\ B e. CC ) -> ( A x. B ) = ( B x. A ) )
4	1, 2, 3	mp2an 426	1 |- ( A x. B ) = ( B x. A )

Syntax hints:   = wceq 1353   e. wcel 2148  (class class class)co 5870   CCcc 7804   x. cmul 7811

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia3 108  ax-mulcom 7907

This theorem is referenced by:  mulcomli  7959  8th4div3  9132  numma2c  9423  nummul2c  9427  9t11e99  9507  binom2i  10621  fac3  10703  tanval2ap  11712  pockthi  12346  sincosq4sgn  14032  2logb9irrALT  14174